Automatic cut-off for air jolt-machines



E. s. CABMAN AND E F. OYSTER. AUTOMATIC CUT-OFF FOR AIR JOLT MACHINES. I

APPLICATION FILED MAR. 17, I919. 1,379,799, Patented May 31, 1921.

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iiTTOgA/E Yo E. S. CARMAN AND E. F. OYSTER.

AUTOMATIC CUT-OFF FOR AIR JOLT MACHINES,

APPLICATION HLED MAR. 17, I919.

1,379 799, Patented May 31,1921.

Ah i' M a a l i ram/Ems.

E. S; CARMAN 'AND E. F. OYSTER. AUTOMATIC CUT-OFF FOR AIR JOLT MACHINES.

APPLICATION FILED MAR. 17, 1919.

Emma May 31, 1921.

3 SHEETS-SHEET 3.

a n 4. M W Mm 0 mm T 7 J w Ov M y ff rare EDWIN s. CABMAN AND near. 1*.orsrnn, or CLEVELAND, onto; Assrenoas To THE CLEVELAND OSBORNmenurncrnarne ooivrranrgor C EVEL ND, onro, A con- IPOBATION or OHIO.

AUTOMATIC CUT-OFF FOR AIR JOLT-MACHINES.

Specification of Letters Patent. Patentgd Ma Application filed March 17,1919. Serial No. 283,148.

To all whom itmay concern:

Be it known that we, EDWIN S. CARMAN and EARL F. OYSTER, citizens theUnited States, and residents of Cleveland, county of Cuyahoga, State ofOhio, have jointly invented a new and useful Improvement in AutomaticCut-Offs for Air Jolt-Machines, of which the following is aspecification, the principleof the invention being herein BX-V plainedand the best mode in which we have contemplated applying that principle,so as to distinguish it from other inventions.

The present invention, relating, as indicated, to an automatic cut-offfor air-jolt machines, is intended for use with a molding machines ofthe well-known jolting type in which the mold is jolted by a pressurefluid actuated piston and cylinder. One of the main objects of theinvention is to provide a device which may be set to automatically cutout the cylinder of the jolt machine after a predetermined number ofjolts, and to accomplish this by the use Y of the same pressure fluidwhich is connected to the jolt machine for the operation 7 of thejolting mechanism. A further object of the invention is the provision ofsuch a device which may be conveniently operated and which will effect arapid valve closure and shut off the pressure fluid. To theaccomplishment of the foregoing and related ends, said invention, then,consists of the means hereinafter fully described and particularlypointed out in the claims.

The annexed drawing and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstituting, however, but one of various mechanical forms in which theprinciple of the invention may be used.

In said annexed drawings Figure 1 is a perspective view, illustratingthe standard type of jolting machine with our improved cut-out inoperative connection'therewith; Fig. 2 is a plan view of the cut-oflmechanism with certain parts thereof in section; Fig. 3 is a centralverticontrolling members when the valve is in .closed position; Fig. 6'is a section onthe line 6-6, Fig. 8, showing the airvalve in the closedposition corresponding to the poesire].

sitions of the valve-controllingparts or Fig.

5; Fig. 7 is a plan view similar, to Fig. 2, but showing the indicatingdial in a differ ent position; Fig. 8 is a section similar to Fig. 5,but showing the valve-controlling parts in the positions correspondingtothe 7 but showing the device in a position ready to operate; Fig. 10 isa section similar to Figs. 5 and 8, but showing the: valvecontrollingparts in positions corresponding to the position of theind-icator dialin Fig.

9; Fig. 11 is'a horizontal section showing the position of theescapement mechanism position of the indicatingdial of Fig. '7 d Fig. 9is a plan view similar to Figs.2 and when the device is in operativeposition;v

and Fig. 12 is a view in perspective of the air valve operating element.

The operation of air jolt machines is usually controlled byan'operator,.who turns on the air, admitting the air to the joltingcylinder, from which it is automatically discharged, the operatorpermitting this operation to continue until he thinks that .the mold isproperlyv jolted. This involves a close personal watch bytheoperator onthe.

vibrations or joltings only, followedby theautomatic rapid shut-off-fofthe pressurefluid, and when once the proper number of vibrations hasbeen determined for any particular conditions, this exact number can begiven to each mold by meansof our device.

In Fig. 1 thereis shown a'standa-rd type of jolting machine, consistingof a'baseor frame which carries a'reciprocatory mol dreceiving table 2,supported and operated by means of. a fluid pressure cylinder 3, thetable of course being connected to the piston in the cylinder.Valve-operating mechanism for the admission and escape of the,

fluid pressure from the cylinder 3 is carried in a suitable valvechamber 4 mounted at the side of the olting cylinder, and thisvalve-controlling mechanism may conveniently take the form of anauxiliary piston valve or other means. Fluid pressure is admitted to thevalve chamber 4 by means of a conduit 7, and is discharged from thecylinder 3 in the usual manner when the table is dropped after leaving.

Our improved automatic cut-off is connected to the, fluid pressureadmission line 7, and is shown at the right in Fig. 1. The device is inthe form of a cylindrical casing, having inlet and exhaust ports 9 and10, respectively, for the connection thereto of the two ports of thefluid pressure conduit 7, these ports'being shown in Fig. 3. The portsare controlled by means of a valve 11 (see Figs. 3 and4), which valve isprovided with a partially circumferentially connecting passage 12forconnecting or disconnecting the inlet or exhaust ports 9 and 10, as willbe readily understood from an inspection of these two figures. Thisvalve is maintained in close connection with the ports by means of aspring 13 mounted between a cap 14, carried on the lower part of thecylindrical casing, and is operated by means of a removable L-shapedvalve stem 15, which extends through the portion of the casing in whichare formed. the ports 9 and 10, the lower portion 15 of the stemengaging in a recess in the valve and the upper part being ournaled inthe casing. Above this portion of the casing just referred to, the valvestem 15 terminates and is fastened to a valve-operated hand or member16.

Easily adjustable means are provided for operating the valve operatedmember or hand 16, such means being carried in the upper part of thecylindrical casing 17 of the device, and the setting mechanism beingmounted on top of the chamber proper.

This valve-setting means includes two hands or lugs .18 and 19,respectively, fixed to a shaft 20 and a sleeve 21, rotatably mountedabout the shaft. The shaft 20 is in alinement with the shaft or valvestem 15 and extends upwardly through the top of the chamber where itcarries an indicating dial 22 keyed thereto. This indicating dial isgraduated about its circumference, as shown in Fig. 9, and bearsnumerals adjacent to the respective graduations, which indicate thenumber of blows that will be delivered by the jolting machine before theoperation of the cut-off upon various settings of this indicatingmember. The sleeve 21 carries externally of the casing an operatinglever or handle 23, which, in the closed position of the valve 11, is incontact with a stop 24 formed on an encircling ring 25,

formed as a part of the cylindrical casing. A lock nut 26 is threaded onthe extending end of the shaft 20 and may be turned down to clamp theindicating dial 22 to the handle 23, in this way clamping together theshaft 20 and sleeve 21, and operating in unison the twovalve-controlling hands or lugs 18 and 19.

Before describing the operation of the dial and valve operating means,the actuating mechanism for closing the valve and cutting off the supplyof fluid pressure through the conduit 7, should be described. On thesleeve 21 is carried a coiled spring 30, the outer end of which isattached to the casing at the point 32, (see Fig. 2), and this springserves to return the sleeve and handle 23 to their normal positionagainst the stop 24 upon the release of the mechanism now to bedescribed, and at the same time the spring serves to return the valve 11to its closed position, as will presently be described.

Also keyed to the sleeve 21 are two ratchet disks 33 and 34, which areshown in plan in Fig. 11 and which are respectively engaged by two pawls35' and 36, (Figs. 2 and 11). The two pawls are pivoted about fixed axesand have their other ends engaged with a stem 37 extending from a piston38 in a cylinder 39, which is formed as a separate casing, removablyattached to the side of the main casing 17. The piston 38, operating inthe cylinder 39 is actuated by means of fluid pressure carried theretoby means of a conduit 40, extending to the valve chamber 4 of the joltmachine and entering the cylinder through a port 41. Fluid pressure isthus admitted through this conduit 40, through the cylinder 39, uponeach admis sion of fluid pressure to the cylinder 3 of the jolt machine,and is simultaneously discharged through the same conduit, when thefluid pressure is discharged from the cylinder 3 of the machine so thatthere is an actuation inward of the piston 38 upon each reciprocation ofthe table of the machine. This piston 38 is normally pressed outward bymeans of a spring 42. The extending stem 37 of the piston is recessed toreceive loosely, therein a re-bent end 44 of the pawl 35, which isconnected, by means of the spring 46, with the rear end of the pawl 36which abuts against the end of the stem 37. Thus upon inward movement ofthe piston 38 the engaging end of the pawl 35 is pressed inward and theengaging end of the pawl 36 is forced out of the toothed disk 33 by therotation of this disk under the influence of the spring 30, and by thepressure of the stem 37 against the other end of this pawl. Similarly,upon the retraction of the piston 38, the pawl 35 is disengaged from itsratchet wheel, and the pawl 36 is pulled into engagement with itsratchet 33 by the spring 46 so that there is a step-by-step orescapement movement of the ratchet wheels 33 and 34 under theintermediate engagement of the pawls 35 and 36 therewith. -Movement ofthese two ratchet disks is effected by thecoiled spring 30, butv thismovement isxan escapement movement and the ratchets. are permitted tomove the width of one tooth. only upon each actuation of the piston 38,which-inturn "corresponds to. each reciprocation ofthe cylinder of thejolt machine. V

As the ratchet disks. 33 and 34: are keyed to the sleeve 21, carryingthe indicating dial 22, it willbeunderstood thatthe graduations on theindicator dial represent the number of notches. which must be releasedone by one bythe pawls to permit the 'return of the indicator dial toits-normal position from any position at which it is preliminarily' set.Thus, if the indicator dial is set at the numeral 25, as will beexplained more clearly presently, it' will require 25 operations'of thejolt machine'and of .the

' tionof the device, assuming that the valve isclosed, and that thehandle 23 is in a position to contact the stop 24, then the nut 26 maybe loosened. and the indicator dial turned in a clockwise direction,(looking downward upon the device, in plan) until the desired number ofjolts, as indicated by figures on the dial, is opposite the centralarrow 53 on the handle. For convenience in setting the dial a handle5'4; is formed thereon. H25 jolts are desired the numeral 25 is broughtinto allnemen-t with the arrow 53 on the handle 23 and the nut 26 isthen tightened to lock together the dial 22, the handle 24, the shaft 20and the; sleeve '21.

This also locks together for simultaneous operation the lugs 18 and 19on the shaft 20 and sleeve 21, respectively. The rotation of'the dial ina clockwise direct1on', however, spaces the -lug or hand 18 aconsiderable distance from the normal or closed position of the valvehand 16, as sho'wn i'n'Fig/8,

'while the valve closin'ghand 19 is in contact with the valve hand 16,-and the latter is in contact with the stop '50, so that the valve is thenclosed. The handle 24 is then swung in a counter-clockwise direction,which causes the" hand '18 to' pick up the valve-operating hand 16 aftera certain I P movement of the hand 18sufiicient to bring it into aposition adjacent tothe stop 50. The valve is then swung into an openposition bybringin'g the valve hand 16 into contacit with the stop 51,as shown FigQlO.

At this time, the valve-closinghand'19 is spaced a considerableidistance from the valve. hand. 16. Asf soonas, the. valve is opened airis admitted to the jolt machine and also tothe cylinder 37, causing astepby-step actuation of theescapement mechanism. Thereisrno otheroperation, and. the

position of the valve isiinotthanged until --the-closing=.hand-19 hasbeen .turned sufficientlyto contact with-the valve-operating hand '16.in its position against the stop 51-. Whenr-this position is reachedtwoblank spaces 55 are reached on -the"periphery.1of the ratchet disks 83-and 34: so that thepawls 35 a'nd36 ride on these-blank'spaces and permitthe spring 30 to. suddenly swing the valve shut by the engagement of thevalve- .closing hand 19 against the valve-operating hand 16. Theblank-spaces'on the ratchet disks 33 and. 34=extend over the same angleas the .angularldistance between the stops '50- 'a,nd 51, so that assoon as these blank spaces on the ratchet disks "are reachedwthe furthermovement of f the V mechanism will" :be rapid, and the-closing. of thevalve will bepra'ctically instantaneous. Itw ill-be-underst'ood that theblank spaces-on the-two ratchet disks are formed in the same. staggeredrelation a'sare the positions of theg .engaging ends of'the pawls 35and'36, so

that these pawls will cease to act at the same moment and permit a freereturn of the --partsto a normal position and an immediate Iswingingshut "of the valve 11.

: Other modes. of applying the principle of ourinvention maybe, employedinsteadof the one expla1ned,'change belng made as regards the mechanismherein disclosed, provided the means stated by any of the followingclaims or the." equivalent of such stated means be employed.

Wetherefore particularly point out and distinctly claim'as'ourinvention:-,

-1. The combination -with pressure-fluid actuated jolt-mechanism, of avalve controlling the supply of pressure-fluid thereto, means tending toclose'said valve, means A -formanually opening said valve, and anescapement adapted to .regulate the closing: of'saidxvalve,

2." The x-combinatio-n with "pressure-fluid actuated jolt-mechanism, ofa valve-controlling the supply of. pressure-fluid thereto, meanstending-toiclose said valve, means 1 for manually opening said valve,and an escapement affected by the operation of said mechanism adapted toregulate the closing of said valve.

3.1Th'ey combination pressure-fluid actuated jolt-mechanism, of a valvecontrolling the .supply of pressure-fluid there- I to, means tendingstoclose said valve, means for manually opening said valve, and anescapement operable by the pressure-fluid from said mechanism adapted toregulate the closing of said valve.

4:. The combination with pressure-fluid actuated jolt-mechanism, of avalve contIOlliIlg the supply of pressure-fluid there to, means tendingto close said valve, means for manually opening said valve, and a manformanually opening said valve, and a manually adjustable escapementaffected by the operation of said mechanism adapted to regulate theclosing of said valve;

6. The combination with pressure-fluid actuated jolt-mechanism, of avalve controlling the supply of pressure-fluid thereto, means tending toclose said valve, means for manually opening said valve, and a manuallyadjustable escapement operable by pressure-fluid from said mechanismadapted to regulate the closing of said valve.

7 The combination with pressure-fluid actuated jolt-mechanism, of avalve controlling the. supply of pressure-fluid thereto, resilient meanstending to 'close said valve, and an escapement operable by the pressurefluid from said mechanism adapted to regulate the closing of said valve.

8. The combination with pressure-fluid actuated jolt-mechanism, of avalve controlling the supply of pressure-fluid thereto, resilient meanstending to close said valve, and an escapement mechanism operable by thepressure-fluid from said mechanism, and adapted to instantaneously closesaid valve after a predetermined cycle of operation of saidjolt-mechanism.

9. The .combination with pressure-fluid 'actuated jolt-mechanism, of avalve controlling the supply of pressure-fluid thereto, resilient meanstending to close said valve, a closing member for said valve, an

closing of said valve.

10. The combination with pressure-fluid actuated jolt mechanism, of avalve con trolling the supply of pressure-fluid thereto, resilient meanstending to close said valve, separate opening and closing members forsaid valve adjustable with respect to each other to: vary the posltionof said closing member in the open position of said valve, an indicatordial connected to said members, and an escapement operable by thepressure-fluid from said mechanism to regulate the closing of saidvalve, said escapement in turn being regulated by the 1n1t1al adjustmentof said indicator dial and said opening and closing members.

11. The combination with pressure-fluid actuated jolt-mechanism, of avalve controlllng the supply of pressure-fluid thereto, means tending toclose said valve, an

escapement including a pawl and ratchet adapted to regulate the closingof said valve, said escapement being operable by the pressure-fluid fromsaid mechanism, and means adapted toeflect operation of said escapementto allow closing of said valve after a predetermined number of cycles ofoperation of said mechanism.

12. The combination with pressure-fluid actuated jolt-mechanism, of avalve controlling the supply of pressure-fluid thereto, means tending toclose said valve, an escapement operable by the pressure-fluid from saidmechanism, said escapement regulating closing of said valve and beingadjustable to r'elease'said valve closing means upon a predeterminednumber of cycles of operation of said mechanism.

13. The combination with pressure-fluid actuated jolt-mechanism, of avalve controlling the'supply of pressure-fluid thereto, means tending toclose said valve instantly when released, an adjustableescapementoperable by pressure-fiuid to release said valve closing meansand permit an instant closing thereof, and means adapted topreliminarily set said escapement to release said valve closing meansafter a predetermined number of cycles of operation of said mechanism.

1 1. The combination with pressure-fluid actuated jolt-mechanism, of avalve controlling the supply of pressure-fluid thereto, 'means tendingto close said valve instantly when released, an adjustable escapementoperable by pressure-fluid to release said valve closing means andpermit an instant closing thereof, and means including an adjustableindicator dial adapted to preliminarily set said escapement to releasesaid valve closing means after a predetermined number of cycles ofoperation.

15. In a device of the character described, the combination of a casinghaving a pressure=fluid passage therethrough, and a valve controllingsuch passage, a second casing removably attached tosaid first-namedcasing, and means tending to close said valve,

escapement means operable by pressurefluid and adapted to regulate theoperation of said valve closing means, said valve closing means and saidescapement being wholly inclosed and carried in said second removablecasing.

' Signed by us, this 1st day of March, 1919.

EDWIN S. CARMAN. EARL F. OYSTER.

